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Re: [VLF_Group] Re: Recording

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  • Tim Bucknall
    Hi Guys, Re: mains inverters, I have found that although my Nikkai puts out some noise, it beats the more expensive model from maplins hands down getting a
    Message 1 of 24 , Apr 1, 2002
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      Hi Guys,
      Re: mains inverters, I have found that although my Nikkai puts out some
      noise, it beats the more expensive model from "maplins" hands down

      getting a mains inverter was probably the best thing i've ever done for
      mobile dxing

      all the best
      Tim Bucknall, N.W England

      www.skywaves.info
      ----- Original Message -----
      From: "pseudospark" <shansen@...>
      To: <VLF_Group@yahoogroups.com>
      Sent: Monday, April 01, 2002 1:26 AM
      Subject: [VLF_Group] Re: Recording


      > --- In VLF_Group@y..., Eric Vogel <evogel@f...> wrote:
      > > I have used a small inverter to run my laptop from the cigarette
      > > lighter socket....the inverter may well make so much noise that it
      > > is a waste of time.
      >
      > Eric, 12 to 120 volt DC-AC inverters may have a high frequency step
      > up stage (several tens of kHz) followed by rectification and then an
      > AC bridge to get the 60 Hz or they may step up at 60 Hz. The former
      > scheme keeps the weight of the magnetics low. Either way the output
      > is 60 Hz and may well cause havoc with VLF reception.
      >
      > However, there are DC-DC converters that take the car battery voltage
      > to the 16 volts required by the laptop. My guess is that the step up
      > is at a high frequency, again to lessen the amount of iron. I've
      > never used one of these but it'd be interesting to know how they work
      > in terms of VLF interference.
      >
      > As for my project, I loaded Gram 6 onto one of my IBM 380s and it
      > looks like a great solution for field recording. I guess the ultimate
      > add ons for this old laptop would be a VXpocket PCMCIA sound card (a
      > few hundred dollars) and an Electrovaya external 11 A-H battery
      > (another few hundred dollars).
      >
      > Steve Hansen
      >
      >
      >
      >
      >
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